Handsaw



H. MYERS HANDSAW Get. 10, 1950 Filed Dec. 24, 1947 Patented st. 10, 19502.525.235 I naunsaw Hugh Myers, London, England Application December 24.1947, Serial No. 793,738 In Great Britain Becember 2, 1946 Section 1,Publiclbaw 690, August 8, 1946 Patentexpires December 2, 1966 7 1 Claim.1

This invention relates to hand saws and has particular reference to aknown form of keyhole or pad saw in which a blade of hacksaw type isprovided along its back edge with a reciprocatory support which isslidably mounted in a member adapted to be gripped by hand to whichhandling member the blade is clamped, so that as the handling member isthrust forward to cause the saw blade to cut the work, the reciprocatorysupport whilst still pressing down on the back edge of the blade ispressed back by its contact with the work against the resistance of aspring which is anchored at one end to the handling member and at theother end to the reciprocatory support.

In the above connection it has been proposed to provide a keyhole or padsaw of the character specified in which the handle was of pistol gripshape and surmounted by a comparative short body which Was made integralwith the handle grip and provided with a longitudinal tunnel forslidably supporting the reciprocatory blade support, the rear of whichlatter projects through said tunnel and has its extremity at all timeslocated at the rear of the back end of the tunnelled body. Above andparallel to the tunnel the handle is provided with a housing to thefront end of which the front end of a tension spring is anchored, Whilstthe rear end of the spring is attached to the rearwardly extendingextremity of the reciprocatory blade support. Whenthe blade support issituated at the forward end of its stroke, the collapsed tension springis accommodated entirely within said spring housing. As thereciprocatory support moves rearwardly the rear portion of the extendingspring is drawn out of the housing and is uncovered. This may prove tobe dangerous in the event of spring breakage.

The object of the present invention is to provide a hand keyhole or padsaw of the same general form as that described but which incorporatessome important novel constructional features, so that at no time is thecontrol spring of the reciprocatory blade support uncovered and furtherthe hand grip of the saw ma be adjusted in relation to the plane inwhich the blade saw reciprocates.

In accordance with the'present invention the body of the sawincorporates an elongated tubular housing in which the reciprocatoryblade support is slidably mounted and which encloses at all times thecontrol spring for the reciprocatory blade support. Preferably thecontrol spring is of compression type and is disposed within the housingsubstantially in axial alignment with the reciprocatory blade support.The housing may be and preferably is made of sufficient length toaccommodate all except the front end portion of the blade support whensaid support has receded into the housing. Further a hand grip isassociated with the tubular housing and may be mounted in such a manneras to permit of its adjustment in relation to the tubular housing.Primarily this adjustment is for the purpose of altering the position ofthe hand grip by longitudinal movement, but may also be such as to alterthe angular disposition of the hand grip in relation to the plane inwhich the saw blade reciprocates.

A preferred embodiment of the present invention is illustrated in theaccompanying drawings, wherein:

Fig. 1 is aside elevation,

Fig. 2 is a longitudinal sectional elevation, and

Fig. 3 is an enlarged cross-section on line IIIIII of Fig. 1.

In the form illustrated the body of the saw comprises an elongatedtubular housing i of circular cross section at the forward end of whichis mounted a head member 2 which combines the functions of guiding thereciprocatory blade support 3 and of temporarily clamping in fixedrelation to the housing i the rear end of a hacksaw type blade 4. Ahandle is mounted on the housing I and this handle consists of a handgrip portion 5 surmounted by a split sleeve portion 6 within which saidtubular housing I is adapted to be received and clamped. Alternativel oradditionally a hand gripping portion may be provided on the housing Iitself, for example, by fitting a rubber sheath thereover, such as usedon the handlebars of bicycles. The guide portion of the head member 2consists of a bore 1 having a diameter to receive snugly and slidablythe rodlike reciprocatory support 3 for the clamped blade 4. Theclamping of the blade 4 is effected by passing the rear end thereof intoa narrow longitudinal slot 8 which opens into the guiding bore 1 andscrewing one or more binding screws 9 in tapped holes ill in the wall ofthe head member 2 into contact with one side of the blade 4. The bottomof the slot 8 is widened by undercutting to form a channel ll wideenough to accommodate freely the laterally splayed teeth 4a of the blade4. The back edge db of the blade 5 is received within a narrowlongitudinal groove l2 provided in the underside of the reciprocatoryblade support 3. The forward end 3a of the reciprocatory blade support 3is of larger diameter than the stem of the support 3 and has a pair ofoppositely disposed flats 3b. This fiat-sided end 3a carries an abutmentmember l3 which is preferably detachably mounted on the end 3a, beingsecured by a clamping screw I4. The abutment member I3 is adapted tocome into contact with the face of the work to be sawnand thus afford abacking support for the blade 4 as near as possible to the point ofsawing. The abutment member I3 is preferably provided as shown, with afreely revoluble grooved roller I5 which bears upon the back edge of theblade 4.

The rear end of the tubular housing I is closed by a plug I6 againstwhich the rear end of a coiled compression spring I! presses. The frontend of the spring I? presses against a plug I8, which as shown can bearupon the rear end of the head member 2, or alternatively against awasher, pin or equivalent abutment provided at'the rear extremity of therod-like blade support 3. The extent of the forward movement of theblade support may be limited by the use of a stop element which, asshown in Fig. 2, may be in the form of a small pin I9 projecting abovethe blade support 3 and adapted to contact with the inner face of arecess at the rear end of the head member 2. The blade support 3 may beswung over (when no blade is clamped to the head member 2) to align thestop pin I9 with the slot 8 in which the blade 4 is normally clamped andthus permit of entire disengagement of the blade support 3 from thehousing I and head member 2. The provision of the stop pin I9 is notessential, however, as the rear end I2a of the groove I2 in the bladesupport 3 serves to prevent removal of the support 3 when a blade 4 isclamped in the head member 2.

The split sleeve 6 of the handle is provided with a pinching screw 2|for drawing together two lugs 6a of the sleeve 6 for the purpose ofgripping the tubular housing I within the handle sleeve 6.

I claim:

A saw of the class described, comprising, in combination, an elongatedtubular housing closed at its rear end; a head member fixed to the frontend of the housing and including a'tubular portion having an internalbore and an integral radially offset portion provided with a slotcommunicating with said bore and adapted to receive and accommodate ablade, said head member also having a threaded hole disposed at rightangles to the blade receiving portion of the slot and also provided atits rear end with a reduced portion telescopically fitting into the saidhousing, said portion being provided with a recess whose wall includes acontinuation of said slot, a blade clamping screw in said threaded hole,a blade support slidably mounted in said bore of the tubular portion ofthe head, said support having a groove extending from the underside tothe axis thereof and registering with said slot of the radially offsetportion, said groove having a curved rear end blade abutment portion, apin projecting laterally from the inner end of the blade support andinsertible through the slot of the radially offset portion into therecess to be rotated for engagement with the inner edge of the recess todetachably lock the blade support in the head, a work abutment memberdetachably mounted upon the front end of the blade support and having aroller mounted therein, a blade fitting in the groove of said bladesupport and having its rear end fitting in said slot to be engaged bysaid screw, and a coil spring fitted in said housing and confinedbetween the closed end thereof and a shouldered abutment plug whichengages the end of the recessed portion of said head member.

HUGH MYERS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 405,540 Driuer June 18, 1889488,844 Smith Dec. 27, 1892 1,779,857 Shafer Oct. 28, 1930 2,137,742Jack Nov. 22, 1930 FOREIGN PATENTS Number Country Date 512,611 GreatBritain Sept. 21, 1939

